Audra does not have infinite health, and if she dies, the mission fails. It's recommended to head straight for Khleran to keep her health as high as possible, as the Jottun hit hard, are difficult to stun, and knock Audra around like nobody's business. If you are having difficulty keeping her alive in the fight with Khleran and his Jottun buddies, try wearing damage increasing accessories, use a damage increase potion, and activate Fateshift to unleash maximum carnage.

If you find that Audra is low on health because she dies quickly, simply leave Ghennig and return. Audra's health will be reset and failing the quest will no longer be an inevitable option.

It is still possible to obtain Khleran's unique loot if the quest is failed because of Audra's death. Continue to proceed to the end of the dungeon, and he will be waiting. The quest will still be marked as failed, but the loot will be on his corpse.

If you kill the jottun at the camp BEFORE talking to Audra Firan and getting the quest, It becomes impossible to complete, with the quest marker permanantly pointing to an empty camp, and aparently no way to open the cage